Answer
Carbon = 40.7%
Hydrogen = 5.1%
Oxygen = 54.2%
Work Step by Step
Molecular formula is C4H6O4,
Molecular mass is 118 amu,
Carbon mass = 48/118 * 100% = 40.7%
Hydrogen mass = 6/118 * 100% = 5.1%
Oxygen mass = 64/118 * 100% = 54.2%
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